If you are receiving a purchase issue error, please check the following:

Parental Controls / Restrictions activated:
How to check:

1. Go to your settings and look for the Screen Time tab.
2. Scroll down and check for the Contents & Privacy Restrictions.
3. Click the iTunes & App Store Purchases
4. Make sure that the In-app Purchases is set on "Allow"

Please also check your card details or expiration date